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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec682dda3267856307a3a085587188c40e8d660d584d8c8813d3a725909d3acd' 
  AND token = 'sEjZ6eshhM6YszA5pPQPeerXsPvMw4QtFQM3tWzCeLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}